Ukie snowfall mean. Both 18z (top) and 12z (bottom) include Friday, which isn't much, but I put a link to the 18z Friday totals. My guess is snow is higher on 18z due to losing some northern outliers that had some rain, but that's a wag.
P.s. Ukie goes out to 198hrs, so that could explain higher totals than Eps, or it's timing issues.
https://www.pivotalweather.com/model.php?m=mogrepsgens&p=sn10_acc-mean-imp&rh=2024123118&fh=90&r=us_state_de_md&dpdt=&mc=&pwplus=1